Aerosol-generating system comprising a modular assembly

ABSTRACT

An aerosol-generating system includes a plurality of cartridges and an aerosol-generating device. At least one cartridge of the plurality of cartridges includes a first aerosol-forming substrate, the plurality of cartridges are configured for selective connection to each other to form a cartridge assembly. The aerosol-generating device includes a storage including a second aerosol-forming substrate in the storage, an electric heater configured to heat a portion of the second aerosol-forming substrate from the storage section during use of the aerosol-generating system, and a power supply housing, the power supply housing including a power supply and a controller, the controller configured to control a supply of electrical power from the power supply to the electric heater, the aerosol-generating device being configured to receive the cartridge assembly at a downstream end of the aerosol-generating device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of, and claims priority under 35U.S.C. § 120 to, U.S. application Ser. No. 17/869,137, filed Jul. 20,2022, which is a continuation of U.S. application Ser. No. 17/077,418,filed Oct. 22, 2020, which is a continuation of U.S. application Ser.No. 15/845,062, filed Dec. 18, 2017, which is a continuation ofInternational Application No. PCT/EP2017/081410, filed on Dec. 4, 2017,and further claims priority under 35 U.S.C. § 119 to European PatentApplication No. 16205105.6, filed on Dec. 19, 2016, the entire contentsof each of which are herein incorporated by reference.

BACKGROUND

At least some example embodiments relates to an aerosol-generatingsystem, such as an electrically operated smoking system, comprising amodular cartridge assembly.

One type of aerosol-generating system is an electrically operatedsmoking system. Handheld electrically operated smoking systems maycomprise an aerosol-generating device comprising a battery, controlelectronics and an electric heater for heating an aerosol-formingsubstrate. The aerosol-forming substrate may be contained within part ofthe aerosol-generating device. For example, the aerosol-generatingdevice may comprise a liquid storage portion in which a liquidaerosol-forming substrate, such as a nicotine solution, is stored. Suchdevices, often referred to as e-vapor devices, typically containsufficient liquid aerosol-forming substrate to provide a number of usesequivalent to consuming multiple cigarettes.

SUMMARY

Some devices have attempted to combine an e-vapor configuration with atobacco-based substrate to impart a tobacco taste to the aerosol to theuser.

It would be desirable to provide an aerosol-generating system comprisingmultiple aerosol-forming substrates and which mitigates or eliminates atleast some of these problems with known devices.

According to at least one example embodiment, an aerosol-generatingsystem includes a plurality of cartridges, at least one cartridge of theplurality of cartridges including a first aerosol-forming substrate, theplurality of cartridges are configured for selective connection to eachother to form a cartridge assembly and an aerosol-generating deviceincludes a storage including a second aerosol-forming substrate in thestorage, an electric heater configured to heat a portion of the secondaerosol-forming substrate from the storage during use of theaerosol-generating system, and a power supply housing, the power supplyhousing including a power supply and a controller, the controllerconfigured to control a supply of electrical power from the power supplyto the electric heater, the aerosol-generating device being configuredto receive the cartridge assembly at a downstream end of theaerosol-generating device.

In at least one example embodiment, the aerosol-generating systemfurther includes a mouthpiece configured to connect to at least one ofthe cartridge assembly and the downstream end of the aerosol-generatingdevice.

In an example embodiment, the aerosol-generating device comprises adevice housing defining a cavity at the downstream end of theaerosol-generating device, and the cavity is configured to receive thecartridge assembly.

In an example embodiment, each of the cartridges comprises a firstconnecting portion at a first end of the cartridge and a secondconnecting portion at a second end of the cartridge, and wherein thefirst connecting portion of each cartridge is configured to connect tothe second connecting portion of one of the remaining cartridges.

In an example embodiment, the first connecting portions are configuredto connect to the second connecting portions by an interference fit.

In an example embodiment, each cartridge comprises a cartridge air inletpositioned at the first end of the cartridge and a cartridge air outletpositioned at the second end of the cartridge.

In an example embodiment, each cartridge has a circular cross-sectionalshape.

In an example embodiment, each cartridge comprises a cartridge air inletpositioned on a first side of the cartridge between the first end andthe second end, and a cartridge air outlet positioned on a second sideof the cartridge between the first end and the second end, and the firstside is opposite the second side.

In an example embodiment, each cartridge has a rectangularcross-sectional shape.

In an example embodiment, the aerosol-generating device comprises adevice housing defining a cavity at the downstream end of theaerosol-generating device, the cavity is configured to receive thecartridge assembly, and the aerosol-generating device comprises at leastone airflow blocking element positioned within the cavity to directairflow through each of the cartridges of the cartridge assembly whenthe cartridge assembly is in the cavity.

In an example embodiment, the at least one airflow blocking elementcomprises a set of one or more first airflow blocking parts extendingfrom a first wall of the cavity and a set of one or more second airflowblocking parts extending from a second wall of the cavity opposite thefirst wall, the first airflow blocking parts are spaced apart along thefirst wall and the second airflow blocking parts are spaced apart alongthe second wall, and the first airflow blocking parts are offset fromthe second airflow blocking parts to define a serpentine airflow paththrough the cavity and the cartridge assembly when the cartridgeassembly is in the cavity.

In an example embodiment, the at least one cartridge comprises a firstlayer of porous material extending across the cartridge air inlet, asecond layer of porous material extending across the cartridge airoutlet, and the first aerosol-forming substrate positioned between thefirst layer of porous material and the second layer of porous material.

In an example embodiment, the storage comprises a porous carriermaterial, and the second aerosol-forming substrate is on the porouscarrier material.

In an example embodiment, the aerosol-generating system further includesa liquid transfer element configured such that, in use, a portion of thesecond aerosol-forming substrate is transported by capillary actionalong the transfer element from the porous carrier material to theelectric heater.

In an example embodiment, the storage, the electric heater and theliquid transfer element are in a vaporiser section, the vaporisersection comprising a vaporiser housing forming part of a device housing,and wherein the vaporiser housing comprises an upstream end configuredto connect to the power supply housing and a downstream end defining acavity configured to receive the cartridge assembly.

In an example embodiment, first aerosol-forming substrate is a solid andthe second aerosol-forming substrate is a liquid.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments are further described, by way of example only, withreference to the accompanying drawings in which:

FIG. 1 is a perspective view of an aerosol-generating system accordingto an example embodiment;

FIG. 2 is a perspective view of a cartridge assembly and mouthpiece ofthe aerosol-generating system of FIG. 1 ;

FIG. 3 is an exploded perspective view of a cartridge of the cartridgeassembly of FIG. 2 ;

FIG. 4 is a cross-sectional view of the aerosol-generating system ofFIG. 1 ;

FIG. 5 is a perspective view of an aerosol-generating system accordingto another example embodiment;

FIG. 6 is a perspective view of the cartridge assembly and mouthpiece ofthe aerosol-generating system of FIG. 5 ;

FIG. 7 is an exploded perspective view of a cartridge of the cartridgeassembly of FIG. 6 ; and

FIG. 8 is a cross-sectional view of the aerosol-generating system ofFIG. 5 .

DETAILED DESCRIPTION

Example embodiments will become more readily understood by reference tothe following detailed description of the accompanying drawings. Exampleembodiments may, however, be embodied in many different forms and shouldnot be construed as being limited to the example embodiments set forthherein. Rather, these example embodiments are provided so that thisdisclosure will be thorough and complete. Like reference numerals referto like elements throughout the specification.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein, thesingular forms “a”, “an” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. It willbe further understood that the terms “comprises,” “comprising,”“includes,” and/or “including,” when used in this specification, specifythe presence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

It will be understood that when an element or layer is referred to asbeing “on”, “connected to” or “coupled to” another element or layer, itcan be directly on, connected or coupled to the other element or layeror intervening elements or layers may be present. In contrast, when anelement is referred to as being “directly on”, “directly connected to”or “directly coupled to” another element or layer, there are nointervening elements or layers present. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items.

It will be understood that, although the terms first, second, etc. maybe used herein to describe various elements, components, regions, layersand/or sections, these elements, components, regions, layers and/orsections should not be limited by these terms. These terms are only usedto distinguish one element, component, region, layer or section fromanother region, layer or section. Thus, a first element, component,region, layer or section discussed below could be termed a secondelement, component, region, layer or section without departing from theteachings set forth herein.

Spatially relative terms, such as “beneath”, “below”, “lower”, “above”,“upper”, and the like, may be used herein for ease of description todescribe one element or feature's relationship to another element(s) orfeature(s) as illustrated in the figures. It will be understood that thespatially relative terms are intended to encompass differentorientations of the device in use or operation in addition to theorientation depicted in the figures. For example, if the device in thefigures is turned over, elements described as “below” or “beneath” otherelements or features would then be oriented “above” the other elementsor features. Thus, the example term “below” can encompass both anorientation of above and below. The device may be otherwise oriented(rotated 90 degrees or at other orientations) and the spatially relativedescriptors used herein interpreted accordingly.

Example embodiments are described herein with reference to cross-sectionillustrations that are schematic illustrations of idealized embodiments(and intermediate structures). As such, variations from the shapes ofthe illustrations as a result, for example, of manufacturing techniquesand/or tolerances, are to be expected. Thus, these example embodimentsshould not be construed as limited to the particular shapes of regionsillustrated herein, but are to include deviations in shapes that result,for example, from manufacturing. For example, an implanted regionillustrated as a rectangle will, typically, have rounded or curvedfeatures and/or a gradient of implant concentration at its edges ratherthan a binary change from implanted to non-implanted region. Likewise, aburied region formed by implantation may result in some implantation inthe region between the buried region and the surface through which theimplantation takes place. Thus, the regions illustrated in the figuresare schematic in nature and their shapes are not intended to illustratethe actual shape of a region of a device and are not intended to limitthe scope of this disclosure.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art. It will be further understood that terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and this specification and will not beinterpreted in an idealized or overly formal sense unless expressly sodefined herein.

Unless specifically stated otherwise, or as is apparent from thediscussion, terms such as “processing” or “computing” or “calculating”or “determining” or “displaying” or the like, refer to the action andprocesses of a computer system, or similar electronic computing device,that manipulates and transforms data represented as physical, electronicquantities within the computer system's registers and memories intoother data similarly represented as physical quantities within thecomputer system memories or registers or other such information storage,transmission or display devices.

As used herein, the term “aerosol-forming substrate” (also referred toas a pre-vapor formulation) is used to describe a substrate capable ofreleasing volatile compounds, which can form an aerosol. The aerosolsgenerated from aerosol-forming substrates of aerosol-generating systemsaccording to example embodiments may be visible or invisible and mayinclude vapours (for example, fine particles of substances, which are ina gaseous state, that are ordinarily liquid or solid at roomtemperature) as well as gases and liquid droplets of condensed vapours.

Aerosol-generating systems according to example embodiments provide anaerosol-generating device and a cartridge assembly, wherein thecartridge assembly comprises a combination of one or more cartridgesfrom a plurality of cartridges. That is, the cartridge assembly is amodular assembly, wherein each cartridge forms a module of the assembly.Advantageously, this facilitates customisation of the user experience byallowing the user to assemble a cartridge assembly using any combinationof one or more of the plurality of cartridges.

In an example embodiment, the aerosol-generating system comprises atleast one airflow inlet and at least one airflow outlet. During use, airflows through the aerosol-generating system along a flow path from theairflow inlet to the airflow outlet. Air flows along the flow path froman upstream end of the flow path at the airflow inlet to a downstreamend of the flow path at the airflow outlet.

In an example embodiment, the aerosol-generating system furthercomprises a mouthpiece configured for connection to at least one of thecartridge assembly and the downstream end of the aerosol-generatingdevice. The mouthpiece may be configured to connect to at least one ofthe cartridge assembly and the aerosol-generating device by aninterference fit. In embodiments in which the aerosol-generating systemcomprises at least one airflow outlet, the at least one airflow outletmay be provided in the mouthpiece.

In an example embodiment, the aerosol-generating device comprises adevice housing defining a cavity at the downstream end of theaerosol-generating device, wherein the cavity is configured to receivethe cartridge assembly. Advantageously, providing a cavity for receivingthe cartridge assembly may facilitate the control of airflow across orthrough each cartridge of the cartridge assembly during use of theaerosol-generating system. Advantageously, providing a cavity forreceiving the cartridge assembly may facilitate the user combining thecartridge assembly with the aerosol-generating device.

The cavity may have any suitable cross-sectional shape. Across-sectional shape of the cavity may be substantially the same as across-sectional shape of the cartridge assembly. The cross-sectionalshape may be substantially circular. The cross-sectional shape may bepolygonal, such as rectangular, including square.

The aerosol-generating system may be configured so that the cartridgeassembly is retained within the cavity by an interference fit. Inembodiments in which the aerosol-generating system comprises amouthpiece, the aerosol-generating system may be configured such thatthe mouthpiece retains the cartridge assembly within the cavity when themouthpiece is connected to the aerosol-generating device. The mouthpiecemay be configured to connect to the aerosol-generating device by aninterference fit.

In an example embodiment, each of the cartridges comprises a firstconnecting portion at a first end of the cartridge and a secondconnecting portion at a second end of the cartridge, wherein the firstconnecting portion of each cartridge is configured to connect to thesecond connecting portion of each of the remaining cartridges.Advantageously, such an arrangement allows the plurality of cartridgesto be connected to each other in any order or combination.

In an example embodiment, the first connecting portions are configuredto connect to the second connecting portions by an interference fit.Each of the first connecting portions may comprise a male connector andeach of the second connecting portions may comprise a female connector.Each of the first connecting portions may comprise a female connectorand each of the second connecting portions may comprise a maleconnector.

In an example embodiment, each cartridge comprises a cartridge housingdefining the first and second connecting portions. The cartridge housingmay be formed from any suitable material or combination of materials.Suitable materials include, but are not limited to, aluminium, polyetherether ketone (PEEK), polyimides, such as Kapton®, polyethyleneterephthalate (PET), polyethylene (PE), high-density polyethylene(HDPE), polypropylene (PP), polystyrene (PS), fluorinated ethylenepropylene (FEP), polytetrafluoroethylene (PTFE), polyoxymethylene (POM),epoxy resins, polyurethane resins, vinyl resins, liquid crystal polymers(LCP) and modified LCPs, such as LCPs with graphite or glass fibres.

In an example embodiment, each cartridge comprises a cartridge air inletand a cartridge air outlet to allow air to flow through the cartridgeduring use of the cartridge with the aerosol-generating device. In thoseembodiments in which each cartridge comprises a cartridge housing, thecartridge housing defines the cartridge air inlet and the cartridge airoutlet.

Each cartridge may comprise the cartridge air inlet positioned at theupstream end of the cartridge and the cartridge air outlet positioned ata downstream end of the cartridge. Advantageously, this arrangement mayprovide a shortened cartridge assembly by facilitating linear airflowthrough the cartridges of the cartridge assembly during use of theaerosol-generating system. Each cartridge may have a substantiallycircular cross-sectional shape.

Each cartridge may comprise the cartridge air inlet positioned on afirst side of the cartridge between the upstream end and the downstreamend, and the cartridge air outlet positioned on a second side of thecartridge between the upstream end and the downstream end, wherein thefirst side is opposite the second side. Advantageously, this arrangementmay provide a thin cartridge assembly while retaining a sufficientcross-sectional area for each of the cartridge air inlets and thecartridge air outlets. Each cartridge may have a substantiallyrectangular cross-sectional shape, including square.

In embodiments in which each cartridge comprises the cartridge air inletand the cartridge air outlet on the first and second sides of thecartridge, respectively, and in which the aerosol-generating devicecomprises a cavity for receiving the cartridge assembly, theaerosol-generating system may be configured to facilitate parallel flowof air through each of the cartridges of the cartridge assembly. Theaerosol-generating device may comprise a cavity air inlet positioned toprovide airflow to a first side of the cartridge assembly and a cavityair outlet positioned to receive airflow from a second side of thecartridge assembly.

In an example embodiment, the aerosol-generating system is configured tofacilitate serial flow of airflow through each of the cartridges of thecartridge assembly. The aerosol-generating device may comprise at leastone airflow blocking element. The at least one airflow blocking elementis positioned within the cavity to direct airflow through each of thecartridges of the cartridge assembly when the cartridge assembly isreceived within the cavity. The at least one airflow blocking elementmay form part of the device housing. In an example embodiment, the atleast one airflow blocking element is configured to direct airflow alonga serpentine airflow path through the cartridge assembly during use ofthe aerosol-generating system.

The at least one airflow blocking element may comprise a set of one ormore first airflow blocking elements extending from a first wall of thecavity and a set of one or more second airflow blocking elementsextending from a second wall of the cavity opposite the first wall,wherein the first airflow blocking elements are spaced apart along thefirst wall and the second airflow blocking elements are spaced apartalong the second wall, and wherein the first airflow blocking elementsare offset from the second airflow blocking elements to define aserpentine airflow path through the cavity and the cartridge assemblywhen the cartridge assembly is received within the cavity. In an exampleembodiment, the cavity is configured to receive the cartridge assemblyalong a first direction. That is, the cavity is configured for insertionof the cartridge assembly into the cavity along the first direction. Inan example embodiment, the first airflow blocking elements are spacedapart in the first direction along the first wall. The second airflowblocking elements may be spaced apart in the first direction along thesecond wall. The first airflow blocking elements may be offset along thefirst direction from the second airflow blocking elements to define theserpentine airflow path through the cavity.

Advantageously, defining a serpentine flow path ensures that airflowthrough the aerosol-generating system flows through each cartridge ofthe cartridge assembly.

At least one of the cartridges may comprise a first layer of porousmaterial extending across the cartridge air inlet, a second layer ofporous material extending across the cartridge air outlet, and thecartridge aerosol-forming substrate positioned between the first layerof porous material and the second layer of porous material.Advantageously, the first and second layers of porous material mayretain the cartridge aerosol-forming substrate within the cartridge andalso allow airflow through the cartridge. Each of the first and secondlayers of porous material may comprise a mesh.

Only one of the cartridges may comprise the cartridge aerosol-formingsubstrate. In an example embodiment, at least two of the cartridges mayeach comprise a cartridge aerosol-forming substrate. In an exampleembodiment, a first cartridge comprises a first cartridgeaerosol-forming substrate and a second cartridge comprises a secondaerosol-forming substrate, wherein the first cartridge aerosol-formingsubstrate is different to the second cartridge aerosol-formingsubstrate.

At least one cartridge may comprise a cartridge aerosol-formingsubstrate comprising a solid aerosol-forming substrate. The solidaerosol-forming substrate may comprise tobacco. The solidaerosol-forming substrate may comprise a tobacco-containing materialcontaining volatile tobacco flavour compounds which are released fromthe substrate upon heating.

The solid aerosol-forming substrate may comprise tobacco containingdeprotonated nicotine. Deprotonating the nicotine within tobacco mayadvantageously increase the volatility of the nicotine. Nicotine may bedeprotonated by subjecting the tobacco to an alkalising treatment.

The solid aerosol-forming substrate may comprise a non-tobacco material.The solid aerosol-forming substrate may comprise tobacco-containingmaterial and non-tobacco containing material.

The solid aerosol-forming substrate may include at least oneaerosol-former. As used herein, the term ‘aerosol former’ is used todescribe any suitable known compound or mixture of compounds that, inuse, facilitates formation of an aerosol. Suitable aerosol-formersinclude, but are not limited to: polyhydric alcohols, such as propyleneglycol, triethylene glycol, 1,3-butanediol and glycerine; esters ofpolyhydric alcohols, such as glycerol mono-, di- or triacetate; andaliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyldodecanedioate and dimethyl tetradecanedioate.

In some example embodiments, the aerosol formers include polyhydricalcohols or mixtures thereof, such as propylene glycol, triethyleneglycol, 1,3-butanediol and, most preferred, glycerine.

The solid aerosol-forming substrate may comprise a single aerosolformer. Alternatively, the solid aerosol-forming substrate may comprisea combination of two or more aerosol formers.

The solid aerosol-forming substrate may have an aerosol former contentof greater than 5 percent on a dry weight basis.

The solid aerosol-forming substrate may have an aerosol former contentof between approximately 5 percent and approximately 30 percent on a dryweight basis.

The solid aerosol-forming substrate may have an aerosol former contentof approximately 20 percent on a dry weight basis.

In an example embodiment, the plurality of aerosol-forming cartridgescomprises at least two aerosol-forming cartridges each comprising adifferent solid aerosol-forming substrate. For example, the cartridgesmay comprise different tobaccos or different tobacco blends. Such anarrangement facilitates customisation of the user experience by allowingthe user to select a combination of cartridges to form the cartridgeassembly, the combination of cartridges corresponding to a desiredmixture of tobaccos or tobacco blends.

The liquid aerosol-forming substrate of the liquid storage section maycomprise a tobacco-containing material comprising volatile tobaccoflavour compounds which are released from the liquid upon heating. Theliquid aerosol-forming substrate may comprise a non-tobacco material.The liquid aerosol-forming substrate may include water, solvents,ethanol, plant extracts and natural or artificial flavours. The liquidaerosol-forming substrate may comprise an aerosol former. Suitableaerosol formers include polyhydric alcohols or mixtures thereof, such aspropylene glycol, triethylene glycol, 1,3-butanediol and glycerine.

The liquid aerosol-forming substrate in the liquid storage section maycomprise nicotine.

The liquid aerosol-forming substrate may be free from nicotine. In suchembodiments, the vaporised liquid aerosol-forming substrate may be drawnthrough a solid aerosol-forming substrate of one of the cartridges,during use, to strip one or more volatile compounds from the solidaerosol-forming substrate. The vaporised liquid aerosol-formingsubstrate may strip nicotine from the solid-aerosol-forming substrate. Acartridge having a solid aerosol-forming substrate comprising tobaccocontaining deprotonated nicotine may be particularly suited toembodiments in which the liquid aerosol-forming substrate is free fromnicotine.

The liquid storage section may comprise a porous carrier material,wherein the liquid aerosol-forming substrate is provided on the porouscarrier material. Advantageously, providing the liquid aerosol-formingsubstrate on a porous carrier material may reduce the risk of the liquidaerosol-forming substrate leaking from the liquid storage section.

The porous carrier material may comprise any suitable material orcombination of materials which is permeable to the liquidaerosol-forming substrate and allows the liquid aerosol-formingsubstrate to migrate through the porous carrier material. Preferably,the material or combination of materials is inert with respect to theliquid aerosol-forming substrate. The porous carrier material may or maynot be a capillary material. The porous carrier material may comprise ahydrophilic material to improve distribution and spread of the liquidaerosol-forming substrate. This may assist with consistent aerosolformation. The particular material or materials will depend on thephysical properties of the liquid aerosol-forming substrate. Examples ofsuitable materials are a capillary material, for example a sponge orfoam material, ceramic- or graphite-based materials in the form offibres or sintered powders, a foamed metal or plastics material, afibrous material, for example made of spun or extruded fibres, such ascellulose acetate, polyester, or bonded polyolefin, polyethylene,terylene or polypropylene fibres, nylon fibres or ceramic. The porouscarrier material may have any suitable porosity so as to be used withdifferent liquid physical properties.

At least one cartridge may comprise a cartridge aerosol-formingsubstrate comprising a liquid aerosol-forming substrate. The liquidaerosol-forming substrate may be provided on a porous carrier materialpositioned within the cartridge. Suitable liquid aerosol-formingsubstrates include those described herein with respect to the liquidstorage section of the aerosol-generating device. Suitable porouscarrier materials include those described herein with respect to theliquid storage section of the aerosol-generating device. In an exampleembodiment, the liquid aerosol-forming substrate provided in thecartridge is different to the liquid aerosol-forming substrate providedin the liquid storage section of the aerosol-generating device.

At least one cartridge may comprise a filter material. The filtermaterial may comprise cellulose acetate.

At least one cartridge may comprise a flavorant. The flavorant maycomprise menthol.

At least one cartridge may comprise a first seal extending over thecartridge air inlet and a second seal extending over the cartridge airoutlet. Each cartridge of the plurality of cartridges may comprise afirst seal and a second seal. In an example embodiment, each of thefirst and second seals is a removable seal. Before assembling one ormore cartridges to form the cartridge assembly, the first and secondseals are removed by a user from each cartridge comprising first andsecond seals.

In embodiments in which each cartridge comprises a cartridge housing,preferably each of the first and second seals is secured to thecartridge housing about a periphery of the seal. Each of the first andsecond seals may be secured to the cartridge housing by at least one ofan adhesive and a weld, such as an ultrasonic weld.

Each of the first and second seals may be formed from a sheet material.The sheet material may comprise at least one of a polymeric film and ametallic foil.

The aerosol-generating system may further comprise a liquid transferelement configured so that, in use, liquid aerosol-forming substrate istransported by capillary action along the liquid transfer element fromthe liquid storage section to the electric heater. In embodiments inwhich the liquid storage section comprises a porous carrier material,the liquid transfer element is configured to transport liquidaerosol-forming substrate from the porous carrier material to theelectric heater.

The liquid transfer element may comprise any suitable material orcombination of materials which is able to convey the liquidaerosol-forming substrate along its length. The liquid transfer elementmay be formed from a porous material, but this need not be the case. Theliquid transfer element may be formed from a material having a fibrousor spongy structure. The liquid transfer element preferably comprises abundle of capillaries. For example, the liquid transfer element maycomprise a plurality of fibres or threads or other fine bore tubes. Theliquid transfer element may comprise sponge-like or foam-like material.The structure of the liquid transfer element may form a plurality ofsmall bores or tubes, through which the liquid aerosol-forming substratecan be transported by capillary action. The particular preferredmaterial or materials will depend on the physical properties of theliquid aerosol-forming substrate. Examples of suitable capillarymaterials include a sponge or foam material, ceramic- or graphite-basedmaterials in the form of fibres or sintered powders, foamed metal orplastics material, a fibrous material, for example made of spun orextruded fibres, such as cellulose acetate, polyester, or bondedpolyolefin, polyethylene, terylene or polypropylene fibres, nylonfibres, ceramic, glass fibres, silica glass fibres, carbon fibres,metallic fibres of medical grade stainless steel alloys such asaustenitic 316 stainless steel and martensitic 440 and 420 stainlesssteels. The liquid transfer element may have any suitable capillarity soas to be used with different liquid physical properties. The liquidaerosol-forming substrate has physical properties, including but notlimited to viscosity, surface tension, density, thermal conductivity,boiling point and vapour pressure, which allow the liquidaerosol-forming substrate to be transported through the liquid transferelement. The liquid transfer element may be formed from heat-resistantmaterial. The liquid transfer element may comprise a plurality of fibrestrands. The plurality of fibre strands may be generally aligned along alength of the liquid transfer element.

In embodiments in which the liquid storage section comprises a porouscarrier material, the porous carrier material and the liquid transferelement may comprise the same material. In an example embodiment, theporous carrier material and the liquid transfer element comprisedifferent materials.

The electric heater may be provided separately from one or both of theliquid storage section and the power supply section. In an exampleembodiment, the liquid storage section, the electric heater and, wherepresent, the liquid transfer element are provided together in avaporiser section. In an example embodiment, the vaporiser sectioncomprises a vaporiser housing forming part of a device housing, whereinthe vaporiser housing comprises an upstream end configured forconnection to the power supply section and a downstream end defining acavity configured to receive the cartridge assembly. Advantageously,providing the liquid storage section, the electric heater and, wherepresent, the liquid transfer element in a single vaporiser sectionseparate from the power supply section may facilitate replacement of thevaporiser section (for example, when the liquid aerosol-formingsubstrate has been depleted) without the need to replace the powersupply section.

The electric heater may comprise a resistive heating coil.

The electric heater may comprise a resistive heating mesh.

The resistive heating mesh may comprise a plurality of electricallyconductive filaments. The electrically conductive filaments may besubstantially flat. As used herein, “substantially flat” means formed ina single plane and not wrapped around or otherwise conformed to fit acurved or other non-planar shape. A flat heating mesh can be easilyhandled during manufacture and provides for a robust construction.

The electrically conductive filaments may define interstices between thefilaments and the interstices may have a width of between about 10micrometres and about 100 micrometres. The filaments give rise tocapillary action in the interstices, so that in use, liquidaerosol-forming substrate is drawn into the interstices, increasing thecontact area between the heater assembly and the liquid.

The electrically conductive filaments may form a mesh of size betweenabout 160 Mesh US and about 600 Mesh US (+/−10%) (that is, between about160 and about 600 filaments per inch (+/−10%)). The width of theinterstices is preferably between about 75 micrometres and about 25micrometres. In at least some example embodiments. the percentage ofopen area of the mesh, which is the ratio of the area of the intersticesto the total area of the mesh is between about 25 percent and about 56percent. The mesh may be formed using different types of weave orlattice structures. The electrically conductive filaments may be anarray of filaments arranged parallel to one another.

The electrically conductive filaments may have a diameter of betweenabout 8 micrometres and about 100 micrometres, such as between about 8micrometres and about 50 micrometres, and between about 8 micrometresand about 39 micrometres.

The resistive heating mesh may cover an area of less than or equal toabout 25 square millimetres. The resistive heating mesh may berectangular. The resistive heating mesh may be square. The resistiveheating mesh may have dimensions of about 5 millimetres by about 2millimetres.

The electrically conductive filaments may comprise any suitableelectrically conductive material. Suitable materials include but are notlimited to: semiconductors such as doped ceramics, electrically“conductive” ceramics (such as, for example, molybdenum disilicide),carbon, graphite, metals, metal alloys and composite materials made of aceramic material and a metallic material. Such composite materials maycomprise doped or undoped ceramics. Examples of suitable doped ceramicsinclude doped silicon carbides. Examples of suitable metals includetitanium, zirconium, tantalum and metals from the platinum group.Examples of suitable metal alloys include stainless steel, constantan,nickel-, cobalt-, chromium-, aluminium- titanium- zirconium-, hafnium-,niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese-and iron-containing alloys, and super-alloys based on nickel, iron,cobalt, stainless steel, Timetal®, iron-aluminium based alloys andiron-manganese-aluminium based alloys. Timetal® is a registered trademark of Titanium Metals Corporation. The filaments may be coated withone or more insulators. Preferred materials for the electricallyconductive filaments are 304, 316, 304L, and 316L stainless steel, andgraphite.

In an example embodiment, the electrical resistance of the resistiveheating mesh is preferably between about 0.3 and about 4 Ohms. In otherembodiments, the electrical resistance of the mesh is between about 0.5and about 3 Ohms or about 1 Ohm.

In embodiments in which the electric heater comprises a resistiveheating coil, the pitch of the coil is preferably between about 0.5millimetres and about 1.5 millimetres, and most preferably about 1.5millimetres. The pitch of the coil means the spacing between adjacentturns of the coil. The coil may comprise fewer than six turns, and mayhave fewer than five turns. The coil may be formed from an electricallyresistive wire having a diameter of between about 0.10 millimetres andabout 0.15 millimetres such as about 0.125 millimetres. The electricallyresistive wire may be formed of 904 or 301 stainless steel. Examples ofother suitable metals include titanium, zirconium, tantalum and metalsfrom the platinum group. Examples of other suitable metal alloysinclude, Constantan, nickel-, cobalt-, chromium-, aluminium-titanium-zirconium-, hafnium-, niobium-, molybdenum-, tantalum-,tungsten-, tin-, gallium-, manganese- and iron-containing alloys, andsuper-alloys based on nickel, iron, cobalt, stainless steel, Timetal®,iron-aluminium based alloys and iron-manganese-aluminium based alloys.The resistive heating coil may also comprise a metal foil, such as analuminium foil, which is provided in the form of a ribbon.

The power supply may comprise a battery. For example, the power supplymay be a nickel-metal hydride battery, a nickel cadmium battery, or alithium based battery, for example a lithium-cobalt, alithium-iron-phosphate or a lithium-polymer battery. The power supplymay alternatively be another form of charge storage device such as acapacitor. The power supply may require recharging and may have acapacity that allows for the storage of enough energy for use of theaerosol-generating device with more than one cartridge assembly.

FIG. 1 shows a perspective view of an aerosol-generating system 10according to an example embodiment. The aerosol-generating system 10comprises an aerosol-generating device 12 comprising a power supplysection 14 and a vaporiser section 16. The aerosol-generating system 10further comprises a cartridge assembly 18 and a mouthpiece 20. Thevaporiser section 16 comprises a vaporiser housing 22 that forms part ofa device housing 24. A downstream end of the vaporiser housing 22defines a cavity 26 for receiving the cartridge assembly 18. The cavity26 is configured for insertion of the cartridge assembly 18 into thecavity 26 along a first direction 27.

The cartridge assembly 18 comprises a plurality of cartridges 28. Thecartridges 28 are configured to detachably connect to each other asshown more clearly in FIG. 2 . Each cartridge 28 comprises a cartridgehousing 30 defining a first connecting portion 32 in the form of asocket at a first end of the cartridge 28 and a second connectingportion 34 in the form of a plug at a second end of the cartridge 28.The first connecting portion 32 of each cartridge 28 is configured toconnect to the second connecting portions 34 of the other cartridges 28by an interference fit. Advantageously, this arrangement allows a userto build a customised cartridge assembly 18 by connecting together adesired combination of cartridges 28 in a desired order. A user mayconstruct a cartridge assembly 18 comprising only a single cartridge 28or two or more cartridges 28. The mouthpiece 20 comprises a mouthpiececonnecting portion 36 in the form of a socket for connecting to thesecond connecting portion 34 of the cartridge 28 at the downstream endof the cartridge assembly 18.

FIG. 3 shows an exploded perspective view of one of the cartridges 28.The cartridge 28 comprises a cartridge air inlet 38 in a first side ofthe cartridge housing 30 and a cartridge air outlet 40 in a second sideof the cartridge housing 30. A cartridge aerosol-forming substrate 42 ispositioned within the cartridge housing 30. Layers of porous material 44in the form of mesh screens extend across the cartridge air inlet 38 andthe cartridge air outlet 40 to retain the cartridge aerosol-formingsubstrate 42 in the cartridge housing 30.

Different cartridges 28 may comprise different contents positionedwithin the cartridge housing 30. One or more cartridges 28 may contain adifferent cartridge aerosol-forming substrate 42. One of more cartridges28 may contain a filter material, a flavorant, or both.

FIG. 4 shows a cross-sectional view of the aerosol-generating system 10with the cartridge assembly 18 received within the cavity 26.

The power supply section 14 comprises a system air inlet 46 foradmitting air into the power supply section 14 which includes acontroller 48 and a power supply 50.

The vaporiser section 16 comprises a vaporiser air inlet 52 forreceiving air from the power supply section 14, an airflow passage 54 influid communication with the vaporiser air inlet 52 at its upstream end,and a vaporiser air outlet 56 providing fluid communication between thedownstream end of the airflow passage 54 and the cavity 26.

The vaporiser section 16 further comprises a liquid storage section 57comprising a liquid aerosol-forming substrate 58 absorbed into anannular porous carrier material 60 positioned outside of the airflowpassage 54. A liquid transfer element 62 comprising a capillary wick hasfirst and second ends positioned in contact with the porous carriermaterial 60 and a central portion positioned within the airflow passage54. Liquid aerosol-forming substrate 58 is wicked by capillary actionalong the capillary wick from the porous carrier material 60 to thecentral portion of the capillary wick.

The vaporiser section 16 also comprises an electric heater 64 comprisinga resistive heating coil wound around the central portion of thecapillary wick. During operation of the aerosol-generating system 10,the controller 48 controls a supply of electrical energy from the powersupply 50 to the electric heater 64 to heat and vaporise liquidaerosol-forming substrate 58 from the central portion of the capillarywick. While not illustrated, the controller 48 is connected to theelectric heater 64 to control the supply of energy from the power supply50 to the electric heater 64.

The downstream portion of the vaporiser housing 22 defines a pluralityof first airflow blocking elements 66 extending into the cavity 26 froma first wall of the cavity 26 and a plurality of second airflow blockingelements 68 extending into the cavity 26 from a second wall of thecavity 26. The first airflow blocking elements 66 are offset along thefirst direction 27 from the second airflow blocking elements 68 so that,when the cartridge assembly 18 is received within the cavity 26. Thefirst and second airflow blocking elements 66, 68 cooperate with thecartridge assembly 18 to define a serpentine airflow path through thecavity 26 and each cartridge 28 of the cartridge assembly 18.

At a downstream end of the cavity 26 is a cavity air outlet 70 providingfluid communication between the cavity 26 and the mouthpiece 20. Themouthpiece 20 defines a mouthpiece air outlet 72 for providing airflowfrom aerosol-generating system 10 to a user.

During use of the aerosol-generating system 10, air is drawn into thesystem through the system air inlet 46, through the vaporiser air inlet52 and into the airflow passage 54 where vaporised liquidaerosol-forming substrate 58 is entrained in the airflow. The airflowthen flows through the vaporiser air outlet 56, into the cavity 26 andeach of the cartridges 28 of the cartridge assembly 18 where volatilecompounds from at least one cartridge aerosol-forming substrate 42 areentrained in the airflow. The airflow then flows through the cavity airoutlet 70 and out of the aerosol-generating system 10 through themouthpiece air outlet 72 to deliver to the user the vaporised liquidaerosol-forming substrate 58 and the volatile compounds from the atleast one cartridge aerosol-forming substrate 42.

FIG. 5 shows an aerosol-generating system 100 according to anotherexample embodiment. The aerosol-generating system 100 is similar to theaerosol-generating system 10 shown in FIGS. 1 to 4 , and like referencenumerals are used to designate like parts.

Aerosol-generating system 100 comprises an aerosol-generating device 112that is substantially the same as the aerosol-generating device 12 ofFIGS. 1 and 4 , except for the configuration of a cavity 126. Inparticular, the cavity 126 has a circular cross-sectional shape and doesnot include any airflow blocking elements. This alternative arrangementof the cavity 126 accommodates an alternative cartridge assembly design.

The aerosol-generating system 100 comprises a cartridge assembly 118comprising one or more cartridges 128. The cartridges 128 each have acircular cross-sectional shape and differ from the cartridges 28 shownin FIGS. 1 to 4 by the positioning of each cartridge air inlet 138 andeach cartridge air outlet 140. In particular, each cartridge air inlet138 is positioned in the first end of the cartridge housing 130 and eachcartridge air outlet 140 is positioned in the second end of thecartridge housing 130. Therefore, when one or more cartridges 128 areassembled to form the cartridge assembly 118, a linear airflow path isdefined through the cartridge assembly 118 and the mouthpiece 120, asshown most clearly in FIG. 8 .

Aside from the constructional differences between the cartridge assembly118 shown in FIGS. 5 to 8 and the cartridge assembly 18 shown in FIGS. 1to 4 , the operation of the aerosol-generating system 100 issubstantially the same as the operation of the aerosol-generating system10. As shown, the features of the cartridges 128 in FIGS. 5-8 (e.g., theporous material, first and second connecting portions, porous material,aerosol-forming substrates) are the same as the corresponding featuresin FIGS. 1 to 4 except for shape. The features of the cartridges 128have a circular cross-section. Due to the similarity of these features,same reference numbers have been used in FIGS. 1 to 4 and 5 to 8 .

While a number of example embodiments have been disclosed herein, itshould be understood that other variations may be possible. Suchvariations are not to be regarded as a departure from the spirit andscope of the present disclosure, and all such modifications as would beobvious to one skilled in the art are intended to be included within thescope of the following claims.

1. An aerosol-generating system comprising: a cartridge assemblyincluding at least one cartridge; and an aerosol-generating deviceconfigured to receive the cartridge assembly at a downstream end of theaerosol-generating device, the aerosol-generating device including, astorage storing an aerosol-forming substrate, an airflow channelextending through the storage, a heater configured to heat a portion ofthe aerosol-forming substrate from the storage during use of theaerosol-generating system, and a power supply housing, the power supplyhousing including a power supply and a controller, the controllerconfigured to control a supply of electrical power from the power supplyto the heater.
 2. The aerosol-generating system of claim 1, furthercomprising: a mouthpiece configured to connect to at least one of thecartridge assembly or the downstream end of the aerosol-generatingdevice.
 3. The aerosol-generating system of claim 1, wherein theaerosol-generating device further comprises a device housing defining acavity at the downstream end of the aerosol-generating device, thecavity being configured to receive the cartridge assembly.
 4. Theaerosol-generating system of claim 1, wherein each cartridge of thecartridge assembly comprises a first connecting portion at a first endof the cartridge and a second connecting portion at a second end of thecartridge.
 5. The aerosol-generating system of claim 4, wherein the atleast one cartridge of the cartridge assembly includes a first cartridgeand a second cartridge, and wherein the first connecting portion of thefirst cartridge is configured to connect to the second connectingportion of the second cartridge.
 6. The aerosol-generating system ofclaim 5, wherein the first connecting portion of the first cartridge isconfigured to connect to the second connecting portion of the secondcartridge by an interference fit.
 7. The aerosol-generating system ofclaim 4, wherein each cartridge of the cartridge assembly comprises asingle first connecting portion at the first end of the cartridge and asingle second connecting portion at the second end of the cartridge. 8.The aerosol-generating system of claim 4, wherein each cartridgecomprises a cartridge air inlet positioned at the first end of thecartridge and a cartridge air outlet positioned at the second end of thecartridge.
 9. The aerosol-generating system of claim 8, wherein eachcartridge has a circular cross-sectional shape.
 10. Theaerosol-generating system of claim 4, wherein each cartridge comprises acartridge air inlet positioned on a first side of the cartridge betweenthe first end and the second end, and a cartridge air outlet positionedon a second side of the cartridge between the first end and the secondend, and the first side is opposite the second side.
 11. Theaerosol-generating system of claim 10, wherein each cartridge has arectangular cross-sectional shape.
 12. The aerosol-generating system ofclaim 10, wherein the aerosol-generating device comprises a devicehousing defining a cavity at the downstream end of theaerosol-generating device, the cavity is configured to receive thecartridge assembly, and the aerosol-generating device comprises at leastone airflow blocking element positioned within the cavity to directairflow through each cartridge of the cartridge assembly when thecartridge assembly is in the cavity.
 13. The aerosol-generating systemof claim 12, wherein the at least one airflow blocking element comprisesa set of one or more first airflow blocking parts extending from a firstwall of the cavity and a set of one or more second airflow blockingparts extending from a second wall of the cavity opposite the firstwall, the first airflow blocking parts are spaced apart along the firstwall and the second airflow blocking parts are spaced apart along thesecond wall, and the first airflow blocking parts are offset from thesecond airflow blocking parts to define a serpentine airflow paththrough the cavity and the cartridge assembly when the cartridgeassembly is in the cavity.
 14. The aerosol-generating system of claim 8,wherein the at least one cartridge comprises a first layer of porousmaterial extending across the cartridge air inlet and a second layer ofporous material extending across the cartridge air outlet.
 15. Theaerosol-generating system of claim 1, wherein the storage comprises aporous carrier material, and the aerosol-forming substrate is on theporous carrier material.
 16. The aerosol-generating system of claim 15,further comprising: a liquid transfer element configured such that, inuse, a portion of the aerosol-forming substrate is transported bycapillary action along the liquid transfer element from the porouscarrier material to the heater.
 17. The aerosol-generating system ofclaim 16, wherein the storage, the heater and the liquid transferelement are in a vaporiser section, the vaporiser section comprising avaporiser housing forming part of a device housing, and wherein thevaporiser housing comprises an upstream end configured to connect to thepower supply housing and a downstream end defining a cavity configuredto receive the cartridge assembly.
 18. The aerosol-generating system ofclaim 1, wherein the aerosol-forming substrate is a liquid.
 19. Theaerosol-generating system of claim 1, wherein the storage is annular.